How To Write A Letter For Injury Accident Claim . Make a copy of the signed letter for your records. I feel very sorry to let you know that. Car Accident Demand Letter (Samples & Templates) How to Write from www.wordtemplatesonline.net Follow this up with a proper salutation and a subject line that captures the nature of your letter. I was injured in the crash, and my car was damaged. The sample form letter found below will help you get started with this accident resolution process.